Insulating handle for micrometers, caliper gauges, and similar measuring tools



Nov. 19, 194%. Dl f R DOMELL6F' 2,222,336

INSULATING HAN FOR MICROMETE QALIPER GAUGES,

AND SIMILAR M U G TO v Filed n. 1939 Jnren for.

Patented Nov. 19, 1940 UNITED STATES PATENT OFFICE INSULATING HANDLE FORIVIICROMETERS,

CALIPER GAUGES, AND SIlVIILAR MEASUR- ING TOOLS Application January 4,1939, Serial No. 249,278 In Sweden January 15, 1938 1 Claim.

The present invention relates to a handle for micrometers, calipergauges, and similar measuring tools, for the purpose of insulating suchtools from the warmth of the hand when they are used. The insulatinghandles heretofore used for this purpose usually consist of plates ofleather, wood, Bakelite, or similar heat-insulating materials, which areglued or secured by screws to that portion or the measuring tool whichis usually gripped when the tool is used.

These old insulating devices have the disadvantage, however, that if itis desired, for instance, to repair the measuring tool, and if for thispurpose the tool must be set in a vice, the handles must first beremoved, because otherwise the insulating plates would be damaged, andafterwards they must again be secured in place, which operation isdifiicult and time-wasting.

The main purpose of the present invention is to eliminate thisinconvenience. This purpose is attained according to the invention bythe heat-insulating handle being made in the shape of a spring clamp ofheat-insulating material and preferably having a U-shaped cross-section,

said clamp being adapted to be pushed on to that portion of themeasuring tool which is gripped by the hand and to be retained on thetool solely due to its own spring action. This heatinsulating handle maytherefore be easily and rapidly removed and again put in its place, and

it may be placed at difierent points of the measuring tool where it ismost suitable to grasp the tool for performing difierent measuringoperations.

The spring clamp may suitably be provided on its inside withprojections, protruding ridges or the like which bear against themeasuring tool when the clamp is pushed on to the tool,

so that heat-insulating air spaces are formed between the measuring tooland the remainder of the inside of the clamp. In this Way the heatinsulating capacity of the device is increased considerably.

In the accompanying drawing a constructional form of the invention isillustrated by way of example. Fig. 1 shows a micrometer provided withan insulating handle according to the invention. Fig. 2 is across-section to a larger scale of the insulating handle on the lineII-II .in Fig. 1, and Fig. 3 is a section on the line Il1-III in Fig. 2.

The micrometer shown consists in the usual manner of a frame I, in oneshank of which the usual micrometer screw 2 is screwed, and in the othershank of which the anvil 3 is secured. The insulating handle consists ofa clamp 4 which has a U-shaped cross-section and which is made ofebonite, Bakelite, or other suitable heat-insulating material, and whichis made elastic in such manner thatwhen it is pushed on to the frame I,it is retained on the latter solely owing to its spring action. Theclamp 5 may thus easily be attached to the frame I at the point wherethe operator finds it most convenient to grasp the tool for making acertain measuring operation, for instance, in a position closer to thescrew 2, or closer to the anvil 3, 10 than that shown in Fig. 1.

Owing to its shape the clamp 4 also surrounds the outer edge of theframe I which is directed towards the hand, and thus provides a betterinsulation than that obtained by means of the 15 old arrangement withtwo insulating plates attached to opposite sides of the frame.

In order toincrease the heat-insulating capacity of the clamp its shanksare provided on their inner faces at their free ends with protruding 20ridges 5 which bear against the frame I when the clamp is attached tothe same. In this way heat-insulating air spaces are formed between theframe and the remainder of the inner faces of the shanks of the clamp,at 6 in Fig. 2. For 25 the same purpose the back of the clamp isprovided on its inner side at both ends with ridges I which bear againstthe outer edge of the frame I when the clamp is applied to the latter.By this arrangement a space is also formed between 30 the clamp and theframe 1 between said two ridges I, at 8 in Fig. 3, so that theheat-insulation is improved.

The constructional form above described and illustrated in the drawingis only to be regarded 35 as an example, and it will be understood thatits details may be modified in several ways Without departing from theprinciple of the invention. If deemed necessary, two or more springclamps 4 may, of course, be placed beside one another on 40 the frame ofthe micrometer or caliper gauge.

I claim:

A detachable one-piece insulating handle for a measuring tool which hasa portion to be grasped by the hand, said insulating handle enclosingsaid portion from opposite sides and retained thereon solely by springaction, said insulating handle comprising a single member of aheatinsulating resilient material having a recess therein the oppositewalls of which are spaced apart a distance slightly less than thethickness 50 of said portion, the said opposite walls of said recess insaid member being provided with recesses forming heat-insulating airspaces betweensaid member and said portion when the former is pushed onthe latter. 55

KARL RUDOLF DOMELLCSF.

